Path: utzoo!attcan!uunet!husc6!mailrus!cornell!rochester!udel!burdvax!dvnspc1!tom
From: tom@dvnspc1.UUCP (Tom Albrecht)
Newsgroups: comp.unix.wizards
Subject: Re: Shared memory
Keywords: shared, memory, non-swappable
Message-ID: <112@dvnspc1.UUCP>
Date: 22 Nov 88 21:57:23 GMT
References: <22739@cci632.UUCP>
Organization: Unisys Corporation, Devon, PA
Lines: 18

In article <22739@cci632.UUCP>, rrw@cci632.UUCP (Rick Wessman) writes:
> Does anyone know if non-swappable shared memory is supported by
> System V? I need to know because some of our applications developers
> want it. Our sister division in California supports it, but I cannot
> find documentation for it in the SVID.
> 
> I would appreciate it if someone would point me in the right
> direction.

In V.3 with shmctl, you can specify the SHM_LOCK cmd which locks the shared
segment in memory.  Documentation says that it can only be executed by 
a process that has an effective user ID equal to super user.

SHM_UNLOCK is also available.

-- 
Tom Albrecht
Unisys			UUCP: {sdcrdcf|psuvax1}!burdvax!dvnspc1!tom